gecko-dev/layout/forms/nsButtonFrameRenderer.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */
#include "nsButtonFrameRenderer.h"
#include "nsIRenderingContext.h"
#include "nsCSSRendering.h"
#include "nsPresContext.h"
#include "nsIView.h"
#include "nsIViewManager.h"
#include "nsHTMLAtoms.h"
#include "nsCSSPseudoElements.h"
#include "nsINameSpaceManager.h"
#include "nsStyleSet.h"
#include "nsDisplayList.h"

#define ACTIVE   "active"
#define HOVER    "hover"
#define FOCUS    "focus"

nsButtonFrameRenderer::nsButtonFrameRenderer()
{
  MOZ_COUNT_CTOR(nsButtonFrameRenderer);
}

nsButtonFrameRenderer::~nsButtonFrameRenderer()
{
  MOZ_COUNT_DTOR(nsButtonFrameRenderer);
}

void
nsButtonFrameRenderer::SetFrame(nsFrame* aFrame, nsPresContext* aPresContext)
{
  mFrame = aFrame;
  ReResolveStyles(aPresContext);
}

nsIFrame*
nsButtonFrameRenderer::GetFrame()
{
  return mFrame;
}

void
nsButtonFrameRenderer::SetDisabled(PRBool aDisabled, PRBool notify)
{
  if (aDisabled)
    mFrame->GetContent()->SetAttr(kNameSpaceID_None, nsHTMLAtoms::disabled, EmptyString(),
                                  notify);
  else
    mFrame->GetContent()->UnsetAttr(kNameSpaceID_None, nsHTMLAtoms::disabled, notify);
}

PRBool
nsButtonFrameRenderer::isDisabled() 
{
  // get the content
  return mFrame->GetContent()->HasAttr(kNameSpaceID_None,
                                       nsHTMLAtoms::disabled);
}

class nsDisplayButtonBorderBackground : public nsDisplayItem {
public:
  nsDisplayButtonBorderBackground(nsButtonFrameRenderer* aRenderer)
    : nsDisplayItem(aRenderer->GetFrame()), mBFR(aRenderer) {
    MOZ_COUNT_CTOR(nsDisplayButtonBorderBackground);
  }
#ifdef NS_BUILD_REFCNT_LOGGING
  virtual ~nsDisplayButtonBorderBackground() {
    MOZ_COUNT_DTOR(nsDisplayButtonBorderBackground);
  }
#endif  
  
  virtual nsIFrame* HitTest(nsDisplayListBuilder* aBuilder, nsPoint aPt) {
    return mFrame;
  }
  virtual void Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx,
     const nsRect& aDirtyRect);
  NS_DISPLAY_DECL_NAME("ButtonBorderBackground")
private:
  nsButtonFrameRenderer* mBFR;
};

class nsDisplayButtonForeground : public nsDisplayItem {
public:
  nsDisplayButtonForeground(nsButtonFrameRenderer* aRenderer)
    : nsDisplayItem(aRenderer->GetFrame()), mBFR(aRenderer) {
    MOZ_COUNT_CTOR(nsDisplayButtonForeground);
  }
#ifdef NS_BUILD_REFCNT_LOGGING
  virtual ~nsDisplayButtonForeground() {
    MOZ_COUNT_DTOR(nsDisplayButtonForeground);
  }
#endif  

  virtual void Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx,
     const nsRect& aDirtyRect);
  NS_DISPLAY_DECL_NAME("ButtonForeground")
private:
  nsButtonFrameRenderer* mBFR;
};

void nsDisplayButtonBorderBackground::Paint(nsDisplayListBuilder* aBuilder,
                                            nsIRenderingContext* aCtx,
                                            const nsRect& aDirtyRect)
{
  NS_ASSERTION(mFrame, "No frame?");
  nsPresContext* pc = mFrame->GetPresContext();
  nsRect r = nsRect(aBuilder->ToReferenceFrame(mFrame), mFrame->GetSize());
  
  // draw the border and background inside the focus and outline borders
  mBFR->PaintBorderAndBackground(pc, *aCtx, aDirtyRect, r);
}

void nsDisplayButtonForeground::Paint(nsDisplayListBuilder* aBuilder,
                                      nsIRenderingContext* aCtx,
                                      const nsRect& aDirtyRect)
{
  NS_ASSERTION(mFrame, "No frame?");
  nsPresContext* pc = mFrame->GetPresContext();
  nsRect r = nsRect(aBuilder->ToReferenceFrame(mFrame), mFrame->GetSize());
  
  // draw the focus and outline borders
  mBFR->PaintOutlineAndFocusBorders(pc, *aCtx, aDirtyRect, r);
}

nsresult
nsButtonFrameRenderer::DisplayButton(nsDisplayListBuilder* aBuilder,
                                     nsDisplayList* aBackground,
                                     nsDisplayList* aForeground)
{
  nsresult rv = aBackground->AppendNewToTop(new (aBuilder)
      nsDisplayButtonBorderBackground(this));
  NS_ENSURE_SUCCESS(rv, rv);

  return aForeground->AppendNewToTop(new (aBuilder)
      nsDisplayButtonForeground(this));
}

void
nsButtonFrameRenderer::PaintOutlineAndFocusBorders(nsPresContext* aPresContext,
          nsIRenderingContext& aRenderingContext,
          const nsRect& aDirtyRect,
          const nsRect& aRect)
{
  // once we have all that let draw the focus if we have it. We will need to draw 2 focuses.
  // the inner and the outer. This is so we can do any kind of look and feel some buttons have
  // focus on the outside like mac and motif. While others like windows have it inside (dotted line).
  // Usually only one will be specifed. But I guess you could have both if you wanted to.

  nsRect rect;

  if (mOuterFocusStyle) {
    // ---------- paint the outer focus border -------------

    GetButtonOuterFocusRect(aRect, rect);

    const nsStyleBorder* border = mOuterFocusStyle->GetStyleBorder();
    nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, mFrame,
                                aDirtyRect, rect, *border, mOuterFocusStyle, 0);
  }

  if (mInnerFocusStyle) { 
    // ---------- paint the inner focus border -------------

    GetButtonInnerFocusRect(aRect, rect);

    const nsStyleBorder* border = mInnerFocusStyle->GetStyleBorder();
    nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, mFrame,
                                aDirtyRect, rect, *border, mInnerFocusStyle, 0);
  }
}


void
nsButtonFrameRenderer::PaintBorderAndBackground(nsPresContext* aPresContext,
          nsIRenderingContext& aRenderingContext,
          const nsRect& aDirtyRect,
          const nsRect& aRect)

{
  // get the button rect this is inside the focus and outline rects
  nsRect buttonRect;
  GetButtonRect(aRect, buttonRect);

  nsStyleContext* context = mFrame->GetStyleContext();

  const nsStyleBorder* border = context->GetStyleBorder();
  const nsStylePadding* padding = context->GetStylePadding();

  nsCSSRendering::PaintBackground(aPresContext, aRenderingContext, mFrame,
                                  aDirtyRect, buttonRect, *border, *padding,
                                  PR_FALSE);
  nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, mFrame,
                              aDirtyRect, buttonRect, *border, context, 0);
}


void
nsButtonFrameRenderer::GetButtonOutlineRect(const nsRect& aRect, nsRect& outlineRect)
{
  outlineRect = aRect;
  outlineRect.Inflate(GetButtonOutlineBorderAndPadding());
}


void
nsButtonFrameRenderer::GetButtonOuterFocusRect(const nsRect& aRect, nsRect& focusRect)
{
  focusRect = aRect;
}

void
nsButtonFrameRenderer::GetButtonRect(const nsRect& aRect, nsRect& r)
{
  r = aRect;
  r.Deflate(GetButtonOuterFocusBorderAndPadding());
}


void
nsButtonFrameRenderer::GetButtonInnerFocusRect(const nsRect& aRect, nsRect& focusRect)
{
  GetButtonRect(aRect, focusRect);
  focusRect.Deflate(GetButtonBorderAndPadding());
  focusRect.Deflate(GetButtonInnerFocusMargin());
}

void
nsButtonFrameRenderer::GetButtonContentRect(const nsRect& aRect, nsRect& r)
{
  GetButtonInnerFocusRect(aRect, r);
  r.Deflate(GetButtonInnerFocusBorderAndPadding());
}


nsMargin
nsButtonFrameRenderer::GetButtonOuterFocusBorderAndPadding()
{
  nsMargin focusBorderAndPadding(0,0,0,0);

  if (mOuterFocusStyle) {
    nsStyleBorderPadding  bPad;
    mOuterFocusStyle->GetBorderPaddingFor(bPad);
    if (!bPad.GetBorderPadding(focusBorderAndPadding)) {
      NS_NOTYETIMPLEMENTED("percentage border");
    }
  }

  return focusBorderAndPadding;
}

nsMargin
nsButtonFrameRenderer::GetButtonBorderAndPadding()
{
  nsStyleContext* context = mFrame->GetStyleContext();

  nsMargin innerFocusBorderAndPadding(0,0,0,0);
  nsStyleBorderPadding  bPad;
  context->GetBorderPaddingFor(bPad);
  if (!bPad.GetBorderPadding(innerFocusBorderAndPadding)) {
    NS_NOTYETIMPLEMENTED("percentage border");
  }
  return innerFocusBorderAndPadding;
}

/**
 * Gets the size of the buttons border this is the union of the normal and disabled borders.
 */
nsMargin
nsButtonFrameRenderer::GetButtonInnerFocusMargin()
{
  nsMargin innerFocusMargin(0,0,0,0);

  if (mInnerFocusStyle) {
    // get the outer focus border and padding
    const nsStyleMargin* margin = mInnerFocusStyle->GetStyleMargin();
    margin->GetMargin(innerFocusMargin);
  }

  return innerFocusMargin;
}

nsMargin
nsButtonFrameRenderer::GetButtonInnerFocusBorderAndPadding()
{
  nsMargin innerFocusBorderAndPadding(0,0,0,0);

  if (mInnerFocusStyle) {
    // get the outer focus border and padding
    nsStyleBorderPadding  bPad;
    mInnerFocusStyle->GetBorderPaddingFor(bPad);
    if (!bPad.GetBorderPadding(innerFocusBorderAndPadding)) {
      NS_NOTYETIMPLEMENTED("percentage border");
    }
  }

  return innerFocusBorderAndPadding;
}

nsMargin
nsButtonFrameRenderer::GetButtonOutlineBorderAndPadding()
{
  nsMargin borderAndPadding(0,0,0,0);
  return borderAndPadding;
}

// gets the full size of our border with all the focus borders
nsMargin
nsButtonFrameRenderer::GetFullButtonBorderAndPadding()
{
  return GetAddedButtonBorderAndPadding() + GetButtonBorderAndPadding();
}

// gets all the focus borders and padding that will be added to the regular border
nsMargin
nsButtonFrameRenderer::GetAddedButtonBorderAndPadding()
{
  return GetButtonOuterFocusBorderAndPadding() + GetButtonInnerFocusMargin() + GetButtonInnerFocusBorderAndPadding();
}

/**
 * Call this when styles change
 */
void 
nsButtonFrameRenderer::ReResolveStyles(nsPresContext* aPresContext)
{
  // get all the styles
  nsStyleContext* context = mFrame->GetStyleContext();
  nsStyleSet *styleSet = aPresContext->StyleSet();

  // style for the inner such as a dotted line (Windows)
  mInnerFocusStyle = styleSet->ProbePseudoStyleFor(mFrame->GetContent(),
                                                   nsCSSPseudoElements::mozFocusInner,
                                                   context);

  // style for outer focus like a ridged border (MAC).
  mOuterFocusStyle = styleSet->ProbePseudoStyleFor(mFrame->GetContent(),
                                                   nsCSSPseudoElements::mozFocusOuter,
                                                   context);
}

nsStyleContext*
nsButtonFrameRenderer::GetStyleContext(PRInt32 aIndex) const
{
  switch (aIndex) {
  case NS_BUTTON_RENDERER_FOCUS_INNER_CONTEXT_INDEX:
    return mInnerFocusStyle;
  case NS_BUTTON_RENDERER_FOCUS_OUTER_CONTEXT_INDEX:
    return mOuterFocusStyle;
  default:
    return nsnull;
  }
}

void 
nsButtonFrameRenderer::SetStyleContext(PRInt32 aIndex, nsStyleContext* aStyleContext)
{
  switch (aIndex) {
  case NS_BUTTON_RENDERER_FOCUS_INNER_CONTEXT_INDEX:
    mInnerFocusStyle = aStyleContext;
    break;
  case NS_BUTTON_RENDERER_FOCUS_OUTER_CONTEXT_INDEX:
    mOuterFocusStyle = aStyleContext;
    break;
  }
}